^I saw a wrench exactly like the 13 x 17 except that instead of saying Yamaha, it said Mercedes
For real -- same supplier I guess. Point being you might be able to find the 10 x 12 in old Mercedes stuff.
You will use the 10 and 12 so much though that it pays to have good wrenches, which will still fit in the pouch. I found I was using the 10 so much that I bought a little Snap-on, just to be cool.